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  • 1
    Electronic Resource
    Electronic Resource
    Reversible Degradation of Adenosine Triphosphate to Inosinic Acid during a Single Muscle Twitch (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 1287-1288 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Isolated fibres from the frog s semi-tendinosus muscle were stretched perpendicular to a monochromatic ultra-violet beam. The light intensity was measured with a photomultiplier and the changes in photoelectric current recorded on a cathode-ray oscilloscope (Fig.1: lower curves; a positive ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1781287b0
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  • 2
    Electronic Resource
    Electronic Resource
    Sensitized photo-oxidation of methylcyclohexane as a thin film on seawater by irradiation with natural sunlight (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 352 (1995), S. 357-363 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Methylcyclohexane dissolved in and forming a thin film on purified seawater with traces of anthraquinone added as triplet sensitizer was exposed to natural sunlight in a quartz flask. The water was circulated through a glass cartridge filled with Amberlite XAD-2 for the concentration of reaction products which were identified by GC/MS after elution and silica gel chromatography. They included isomeric methylcyclohexanols as the principal components, primary hydroperoxides, a tentatively identified secondary peroxide, methylcyclohexanones, and acyclic ketones. Mass spectra and mechanisms are discussed as well as possible biological consequences of the formation of these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322233
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of low molecular weight carbonyl compounds by sensitized photochemical decomposition of aliphatic hydrocarbons in seawater (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 772-776 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Anthraquinone has been found to be a compound occuring frequently in seawater. Excited by solar radiation it acts as one of many natural and man-made photosensitizers and can thus be used as a model substance for the study of sensitized photochemical reactions of environmental chemicals. Experimentally it has been shown to mediate the oxidative photochemical decomposition of aliphatic hydrocarbons which, lacking absorption bands in the solar UV range at sea level, are by themselves photochemically inert. Formaldehyde, smaller amounts of acetaldehyde and acetone as well as a still unidentified carbonyl compound are the principal low molecular weight products generated in the anthraquinone-sensitized photooxidation, with natural as well as artificial sunlight, of straight chain saturated hydrocarbons accommodated in high purity water. Qualitatively the same results were obtained in natural seawater as reaction medium from which particles were removed by glass fiber filtration and organic compounds by adsorption on activated charcoal. The concomittant generation of homologous series of methylketones and terminal alkenes suggest a decomposition mechanism involving cyclic electron rearrangement in a 6-membered transition state. Based on HPLC analysis of their 2,4-dinitrophenylhydrazones, the rates of volatile carbonyl generation in the sensitized photo-oxidation of n-tetradecane was determined in the liquid phase. Also determined was the rate of formaldehyde formation in the gas phase from n-tetradecane and from two Brazilian crude oils. The rates of generation of acetaldehyde and acetone could not be determined in the experiments with crude oils because of irregular changes of concentrations with time. The rate of concentration increase of formaldehyde in the vapour phase over the hydrocarbon surface film was similar to that in the water underneath. The artifical light source was a high pressure xenon lamp whose emission spectrum closely resembles that of natural sunlight at sea level. It was calibrated against the intensity of natural sunlight using pnitroacetophenone/pyridine as binary chemical actinometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321742
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  • 4
    Electronic Resource
    Electronic Resource
    Glycoside von Aminozuckern, IV. Synthese von Disacchariden der 2-Amino-2-desoxy- und der 3-Amino-3-desoxy-D-glucose (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 869-875 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Glycosides of Amino Sugars, IV. Synthesis of Disaccharides of 2-Amino-2-deoxy- and 3-Amino-3-deoxy-D-glucoseThe solvent dependency of the Koenigs-Knorr reaction between two derivatives of 2-amino-2-deoxy-D-glucose (3 and 4) was investigated. The highest yield of the α-disaccharide 5 was obtained in the system toluene/1,2-dimethoxyethane. The condensation of two derivatives of 3-amino-3-deoxy-D-glucose (11 and 13) under similar conditions yielded the 1,6-linked α-and β-disaccharides (15, 14) of this sugar which were unknown until now.
    Notes: Die Koenigs-Knorr-Reaktion zwischen zwei Derivaten der 2-Amino-2-desoxy-D-glucose (3 und 4) wurde in Abhängigkeit vom Lösungsmittel untersucht. Die höchste Ausbeute an α-Disaccharid 5 konnte in einem Gemisch von Toluol und 1,2-Dimethoxyäthan erhalten werden. Die Kondensation zweier Derivate der 3-Amino-3-desoxy-D-glucose (11 und 13) unter ähnlichen Bedingungen führte zu den bisher unbekannten 1,6-verknüpften α- und β-Disacchariden (15 bzw. 14) dieses Zuckers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070313
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  • 5
    Electronic Resource
    Electronic Resource
    Glycoside von Aminozuckern, V. Synthese von Disacchariden der 2,3-Diamino-2,3-didesoxy-D-glucose, I (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2585-2600 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Glycosides of Amino Sugars, V. Synthesis of Disaccharides of 2,3-Diamino-2,3-dideoxy-D-glucose, IOn dinitrophenylation with 1-fluoro-2,4-dinitrobenzene 2,3- diamino-2,3-dideoxy-D-glucose preponderantly yields the 1,2,3-trisubstituted derivative 5 the structure of which was proved by several methods. The N,N′-dinitrophenyl derivative 2 could be obtained from the glycoside 17 and was converted into the bromide 19. On reaction with a derivative of 3-azido-3-deoxy-D-glucose (24) 19 yielded the α- and β-disaccharides 25 and 27.
    Notes: 2,3-Diamino-2,3-didesoxy-D-glucose-dihydrochlorid liefert bei der Dinitrophenylierung mit 1-Fluor-2,4-dinitrobenzol überwiegend das 1,2,3-Trisubstitutionsderivat 5. dessen Konstitution auf mehreren Wegen bewiesen wurde. Das über das Glycosid 17 erhältliche N,N′-Dinitrophenylderivat 2 konnte in das Bromid 19 übergeführt und dieses mit einem Derivat der 3-Azido-3-desoxy-D-glucose 24 zum α- und β-Disaccharid 25 bzw. 27 verknüpft werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070819
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  • 6
    Electronic Resource
    Electronic Resource
    Der Einfluss der O-Acetylierung auf das konformative Verhalten des Kollagen-Modellpeptides (L-Pro-L-Hyp-Gly)10 und von Gelatine (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 701-708 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Influence of O-Acetylation upon the Conformational Behaviour of the Collagen Model Peptide (L-pro-L-Hyp-Gly)10 and of Gelatin(L-Pro-L-Hyp-Gly)10 which can be considered as a model peptide for collagen structure studies has been synthesized by the Merrifield technique. Subsequently, the hydroxyprolin residues have been acetylated by acetic acid anhydride in trifluoroacetic acid. In the same way, the hydroxyl groups of commercial bovine gelatin have been selectively acetylated. The influence of blocking the hydroxyl groups upon the thermal stability of the tripel helix formed by (L-Pro-L-Hyp-Gly)10 and upon the transition temperature and the gel stability of the gelatin has been investigated by the measurement of optical rotation, circular dichroism, molecular weights and gel melting points. The results show that O-acetylation reduces the thermal stability of the collagen-like tripel helices formed in solution by the synthetic peptide and during the gelation process of gelatin. Our experiments support data previously published by various authors indicating that the hydroxyl group of hydroxyprolin plays an important role in stabilizing the collagen tripel helix. The possibility to use O-acetylated gelatin with its reduced gel forming capability for the preparation of plasma substitute solutions is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610218
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  • 7
    Electronic Resource
    Electronic Resource
    Berechnung der Streulichtfunktion für teilweise orientierte stäbchenförmige Teilchen (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1921-1927 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. An attempt is made to calculate the changes in intensity of scattered light due to partial orientation, when the scattering particles are rod-shaped dipols in an electric field. For the case in which the direction of the field is identical with the median between the direction of the incident beam and the direction of observation, the relative decrease in intensity of the scattered light will be s2χ2/270. For the case in which the field is perpendicular to the median (i.e., in the “mirrorplane”), a relative increase of intensity of s2χ2/540 will result; \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm s} = 2\,\pi ({\rm L}/\lambda)2\,\sin \vartheta /2,\quad x = {\rm D}\,E/k\,{\rm T} $$\end{document}.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370702
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  • 8
    Electronic Resource
    Electronic Resource
    Molekulare Resonanzsysteme VIII. Zwischenprodukte bei der Aufspaltung des Pyridins. Ein langkettiger einfacher Polymethinfarbstoff (1942)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 25 (1942), S. 1628-1639 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19420250724
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Berücksichtigung zeitlich veränderter Belastung bei der Festigkeitsberechnung von ApparatekomponentenVorgetragen auf dem 7. Konstruktions-Symposion der DECHEMA, „Konstruktion und Verformungsverhalten“, 4./5. Dezember 1975 in Frankfurt/M. (1976)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 48 (1976), S. 649-649 
    Details
    ISSN: 0009-286X
    Keywords: Festigkeitsrechnung ; Apparatekomponenten ; Wechselbelastung ; Zeitfestigkeitsbereich ; zulässige Lastwechselkurven ; Subkriech- und Kriechbereich ; Schädigungsakkumulation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330480720
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Theorie elektrophoretischer Trennverfahren auf porösen Trägern (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 424-434 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) Es werden rechnerische Ansätze zur Beschreibung der Konzentrationsverteilung für elektrophoretische Trennverfahren auf porösem Träger hergeleitet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360212
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